[BC] WLS Tx History Update

[Mark Durenberger]

WCCO was late in adding a second site, feeding a rented tower.  (They had 
once used a long-wire backup scheme, but that fell into disuse.)

Latest news is that they're abandoning the second tower site and going back 
to the long-wire idea.

You gotta love CBS..."hey, let's jeopardize the market's best-billing 
station, to save a few dollars in rental fees."  <g>

Regards,

Mark Durenberger

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From: <peterh5322 at rattlebrain.com>

>
>> WGN Chicago  has a 10 kw Tx in an out building as transmitter 3.  It
>> solved a fire protection issue having a transmitter in a second building.
>> Main building suffers fire damage backup survives and gives a Plan B
>> recovery.
>
> All Chicago former Class I-As have second antennas.
>
> I believe WLS was the last to construct theirs, and it was constructed as
> 199' and with no lighting.
>
> The other Chicago former Class I-As had their auxiliary ND antennas long
> before WLS's.
>
>> For WLS the Tx 3 lives with no power or antenna path.  One time both 50's
>> were down and the back up came into action as the only working
>> transmitter.  One time in 22 years.  It does stop the phone from
>> ringing...Alway asking how long will we be off?  Answer,  A lot short if
>> you stop call me. Some power is better than no power.
>
> According to Warren (off-List communication), their 199' second antenna is
> capable of 50 kW.
>
> KFI's very short second antenna is capable of only 25 kW, but KNX's rather
> taller (135 degrees, about 340 feet) second antenna is undoubtedly capable
> of 50 kW.
>
> KNX had no second antenna until after a terrorist felled its ca. 1936
> antenna in the 1960s, after which a 195 degree replacement was installed,
> and also a 135 degree second antenna. As KNX was originally on 1050 (and
> WLS was originally on 870) the old mains "grew" in effective height with
> the 1941 forced change in frequency.
>